ceph/src/boost/libs/log/include/boost/log/expressions/attr_fwd.hpp

   1 /*
   2  *          Copyright Andrey Semashev 2007 - 2015.
   3  * Distributed under the Boost Software License, Version 1.0.
   4  *    (See accompanying file LICENSE_1_0.txt or copy at
   5  *          http://www.boost.org/LICENSE_1_0.txt)
   6  */
   7 /*!
   8  * \file   attr_fwd.hpp
   9  * \author Andrey Semashev
  10  * \date   21.07.2012
  11  *
  12  * The header contains forward declaration of a generic attribute placeholder in template expressions.
  13  */
  14
  15 #ifndef BOOST_LOG_EXPRESSIONS_ATTR_FWD_HPP_INCLUDED_
  16 #define BOOST_LOG_EXPRESSIONS_ATTR_FWD_HPP_INCLUDED_
  17
  18 #include <boost/log/detail/config.hpp>
  19 #include <boost/log/attributes/fallback_policy_fwd.hpp>
  20
  21 #ifdef BOOST_HAS_PRAGMA_ONCE
  22 #pragma once
  23 #endif
  24
  25 namespace boost {
  26
  27 #ifndef BOOST_LOG_DOXYGEN_PASS
  28
  29 namespace phoenix {
  30
  31 template< typename >
  32 struct actor;
  33
  34 } // namespace phoenix
  35
  36 #endif
  37
  38 BOOST_LOG_OPEN_NAMESPACE
  39
  40 namespace expressions {
  41
  42 /*!
  43  * An attribute value extraction terminal
  44  */
  45 template<
  46     typename T,
  47     typename FallbackPolicyT = fallback_to_none,
  48     typename TagT = void
  49 >
  50 class attribute_terminal;
  51
  52 /*!
  53  * An attribute value extraction terminal actor
  54  */
  55 template<
  56     typename T,
  57     typename FallbackPolicyT = fallback_to_none,
  58     typename TagT = void,
  59     template< typename > class ActorT = phoenix::actor
  60 >
  61 class attribute_actor;
  62
  63 } // namespace expressions
  64
  65 BOOST_LOG_CLOSE_NAMESPACE // namespace log
  66
  67 } // namespace boost
  68
  69 #endif // BOOST_LOG_EXPRESSIONS_ATTR_FWD_HPP_INCLUDED_